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<div class="title">nrf51/Board/nrf6310/gpiote_example/main.c</div>  </div>
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<a href="nrf6310_2gpiote__example_2main_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00046"></a>00046 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00047"></a>00047 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00048"></a>00048 <span class="preprocessor">#include &quot;nrf.h&quot;</span>
<a name="l00049"></a>00049 <span class="preprocessor">#include &quot;nrf_gpiote.h&quot;</span>
<a name="l00050"></a>00050 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00051"></a>00051 
<a name="l00052"></a>00052 
<a name="l00053"></a><a class="code" href="group__nrf__gpiote__example.html#gaf9861a9f0be7addcd0683019de261336">00053</a> <span class="preprocessor">#define GPIO_OUTPUT_PIN_NUMBER 8  </span>
<a name="l00054"></a><a class="code" href="group__nrf__gpiote__example.html#ga0416c15a1056d379260f5c4860a66d8f">00054</a> <span class="preprocessor">#define GPIOTE_CHANNEL_NUMBER  0  </span>
<a name="l00059"></a><a class="code" href="group__nrf__gpiote__example.html#gad22626704ea5d45f863163500e355cc3">00059</a> <span class="preprocessor">static void gpiote_init(void)</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span>{
<a name="l00061"></a>00061   <span class="comment">// Power on the GPIOTE peripheral</span>
<a name="l00062"></a>00062   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_GPIOTE_Power &lt;&lt; POWER_PERPOWER_GPIOTE_Pos);
<a name="l00063"></a>00063 
<a name="l00064"></a>00064   <span class="comment">// Wait for the power up</span>
<a name="l00065"></a>00065   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_GPIOTE_Msk) != (POWER_PERRDY_GPIOTE_Ready &lt;&lt; POWER_PERRDY_GPIOTE_Pos))
<a name="l00066"></a>00066   {
<a name="l00067"></a>00067   }
<a name="l00068"></a>00068 
<a name="l00069"></a>00069   <span class="comment">// Configure GPIO GPIO_OUTPUT_PIN_NUMBER as an output</span>
<a name="l00070"></a>00070   <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(<a class="code" href="group__nrf__gpiote__example.html#gaf9861a9f0be7addcd0683019de261336">GPIO_OUTPUT_PIN_NUMBER</a>);
<a name="l00071"></a>00071 
<a name="l00072"></a>00072   <span class="comment">// Configure GPIOTE channel GPIOTE_CHANNEL_NUMBER to toggle the GPIO  pin state with input</span>
<a name="l00073"></a>00073   <span class="comment">// Note that we can only connect a GPIOTE task to an output pin</span>
<a name="l00074"></a>00074   <a class="code" href="group__nrf__gpiote.html#gab8667667ddf3bdca874df3add96fb622" title="Config GPIOTE channel as output, setting the properly desired output level.">nrf_gpiote_task_config</a>(<a class="code" href="group__nrf__gpiote__example.html#ga0416c15a1056d379260f5c4860a66d8f">GPIOTE_CHANNEL_NUMBER</a>, <a class="code" href="group__nrf__gpiote__example.html#gaf9861a9f0be7addcd0683019de261336">GPIO_OUTPUT_PIN_NUMBER</a>, <a class="code" href="group__nrf__gpiote.html#gga9a424db0997c11092f8f69d52155dd9da00487cd8286ff071ca751cd4a00295d5" title="Toggle.">NRF_GPIOTE_POLARITY_TOGGLE</a>, <a class="code" href="group__nrf__gpiote.html#ggab280bbb7269ab98a97e7b47d906ef9aaae0df1a0e930bfe3b198a9692d9916667" title="Low to high.">NRF_GPIOTE_INITIAL_VALUE_LOW</a>);
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 
<a name="l00080"></a><a class="code" href="group__nrf__gpiote__example.html#gaad16890c50156256e260b5205571ddc4">00080</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__nrf__gpiote__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>(<span class="keywordtype">void</span>)
<a name="l00081"></a>00081 {
<a name="l00082"></a>00082   <span class="comment">// Power ON the PPI peripheral</span>
<a name="l00083"></a>00083   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_PPI_Power &lt;&lt; POWER_PERPOWER_PPI_Pos);
<a name="l00084"></a>00084 
<a name="l00085"></a>00085   <span class="comment">// Wait for the power up</span>
<a name="l00086"></a>00086   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_PPI_Msk) != (POWER_PERRDY_PPI_Ready &lt;&lt; POWER_PERRDY_PPI_Pos))
<a name="l00087"></a>00087   {
<a name="l00088"></a>00088   }
<a name="l00089"></a>00089 
<a name="l00090"></a>00090   <span class="comment">// Configure PPI channel 0 to toggle GPIO_OUTPUT_PIN on every TIMER0 COMPARE[0] match, which is every 200 ms</span>
<a name="l00091"></a>00091   NRF_PPI-&gt;CH0_EEP = (uint32_t)&amp;NRF_TIMER0-&gt;EVENTS_COMPARE[0];
<a name="l00092"></a>00092   NRF_PPI-&gt;CH0_TEP = (uint32_t)&amp;NRF_GPIOTE-&gt;TASKS_OUT[<a class="code" href="group__nrf__gpiote__example.html#ga0416c15a1056d379260f5c4860a66d8f">GPIOTE_CHANNEL_NUMBER</a>];
<a name="l00093"></a>00093 
<a name="l00094"></a>00094   <span class="comment">// Enable PPI channel 0</span>
<a name="l00095"></a>00095   NRF_PPI-&gt;CHEN = (PPI_CHEN_CH0_Enabled &lt;&lt; PPI_CHEN_CH0_Pos);
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 
<a name="l00100"></a><a class="code" href="group__nrf__gpiote__example.html#gadd186346e02f7413d2fa6e72fe5f9562">00100</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__nrf__gpiote__example.html#gadd186346e02f7413d2fa6e72fe5f9562">timer0_init</a>(<span class="keywordtype">void</span>)
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102   <span class="comment">/* Start 16 MHz crystal oscillator */</span>
<a name="l00103"></a>00103   NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED = 0;
<a name="l00104"></a>00104   NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1;
<a name="l00105"></a>00105 
<a name="l00106"></a>00106   <span class="comment">/* Wait for the external oscillator to start up */</span>
<a name="l00107"></a>00107   <span class="keywordflow">while</span> (NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED == 0) 
<a name="l00108"></a>00108   {
<a name="l00109"></a>00109   }
<a name="l00110"></a>00110 
<a name="l00111"></a>00111   <span class="comment">// Power on the TIMER0 peripheral</span>
<a name="l00112"></a>00112   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER0_Power &lt;&lt; POWER_PERPOWER_TIMER0_Pos);
<a name="l00113"></a>00113 
<a name="l00114"></a>00114   <span class="comment">// Wait for the power up</span>
<a name="l00115"></a>00115   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER0_Msk) != (POWER_PERRDY_TIMER0_Ready &lt;&lt; POWER_PERRDY_TIMER0_Pos))
<a name="l00116"></a>00116   {
<a name="l00117"></a>00117   }
<a name="l00118"></a>00118 
<a name="l00119"></a>00119   <span class="comment">// Clear TIMER0</span>
<a name="l00120"></a>00120   NRF_TIMER0-&gt;TASKS_CLEAR = 1;
<a name="l00121"></a>00121 
<a name="l00122"></a>00122   <span class="comment">// Configure TIMER0 for compare[0] event every 200ms</span>
<a name="l00123"></a>00123   NRF_TIMER0-&gt;PRESCALER = 4;      <span class="comment">// Prescaler 4 results in 1 tick == 1 microsecond</span>
<a name="l00124"></a>00124   NRF_TIMER0-&gt;CC[0] = 200*1000UL; <span class="comment">// 1 tick == 1 microsecond, multiply by 1000 to get number in milliseconds</span>
<a name="l00125"></a>00125   NRF_TIMER0-&gt;MODE = TIMER_MODE_MODE_Timer;
<a name="l00126"></a>00126   NRF_TIMER0-&gt;BITMODE = TIMER_BITMODE_BITMODE_24Bit;
<a name="l00127"></a>00127   NRF_TIMER0-&gt;SHORTS = (TIMER_SHORTS_COMPARE0_CLEAR_Enabled &lt;&lt; TIMER_SHORTS_COMPARE0_CLEAR_Pos);
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 
<a name="l00134"></a><a class="code" href="group__nrf__gpiote__example.html#ga840291bc02cba5474a4cb46a9b9566fe">00134</a> <span class="keywordtype">int</span> <a class="code" href="group__gpio__example.html#ga840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136   <a class="code" href="group__nrf__gpiote__example.html#gad22626704ea5d45f863163500e355cc3">gpiote_init</a>();                  <span class="comment">// Configure a GPIO to toggle on a GPIOTE task,</span>
<a name="l00137"></a>00137   <a class="code" href="group__nrf__gpiote__example.html#gadd186346e02f7413d2fa6e72fe5f9562">timer0_init</a>();                  <span class="comment">// using TIMER0 to generate events every 200 ms</span>
<a name="l00138"></a>00138   <a class="code" href="group__nrf__gpiote__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>();                     <span class="comment">// and using a PPI channel to connect the event to the task automatically;</span>
<a name="l00139"></a>00139 
<a name="l00140"></a>00140   NRF_TIMER0-&gt;TASKS_START = 1;    <span class="comment">// after starting the event generation</span>
<a name="l00141"></a>00141 
<a name="l00142"></a>00142   <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00143"></a>00143   {
<a name="l00144"></a>00144                                   <span class="comment">// a GPIO can be toggled without SW intervention</span>
<a name="l00145"></a>00145   }
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 
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